单项选择题
The feed water to the boiler will comprise （）.
A.condensate
B.a small amount of make-up feed
C.A and B
D.None of the above
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相关考题
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单项选择题
Proper combustion in a boiler would be indicated by （）.
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame -
单项选择题
Black smoke coming from a boiler can be caused by （）.
A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio -
单项选择题
Which of the following pumps belongs to centrifugal pump?（）
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
